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HTML

              
                <div class="full-menu">
  <div class="full-menu--middle">
    <button class="menu-toggle menu-toggle--close"></button>
    
    <ul class="main-nav">
      <li><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Work</a></li>
      <li><a href="#">Contact</a></li>
    </ul><!-- /.main nav -->
  </div><!-- /.full menu middle -->
</div><!-- /.full menu -->

<div class="content">
  <button class="menu-toggle">Open full-screen navigation here</button>
  
  <h1>Simple full-screen navigation menu</h1>
  <p>This is simple full-screen navigation menu build on HTML, LESS and jQuery. You can use it as a starter full-screen navigation template for your next project. If you want to see compiled version of LESS just click on <i>"View Compiled"</i> button in CSS section. In CSS there are comments that highlight what's important to include. There is a full tutorial on how to use this full-screen navigation menu at slicejack.com/blog, just click on button bellow to read full article.</p>
  <a href="http://slicejack.com/simple-full-screen-navigation-menu/" class="btn btn--transition">Read more on Slicejack.com</a>
</div><!-- /.content -->
              
            
!

CSS

              
                /*
 * Body and Main styles
 * ----------------------
 * Styles under "Body and Main styles"
 * are not important for full-screen
 * navigation and it's functionalities.
 *
 */

@primary-color: #ffd200;
@secondary-color: #00174f;

body{ 
  color: #fff;
  background-color: @secondary-color;  
  font-family: 'Open sans', Helvetica, sans-serif;
  padding: 50px 60px;
}

h1{
  font-size: 45px;
  color: @primary-color;
}

p, a{
  font-size: 17px;
  line-height: 29px;
  font-weight: 300;
  letter-spacing: 0.5px;
}

a{
  color: #3498db;
  text-decoration: none;
}

:focus{
  outline: none;
}

.btn{
  background-color: @primary-color;
  color: @secondary-color;
  display: inline-block;
  text-decoration: none;
  padding: 13px 30px;
  margin: 30px 0 0 0;
  border-radius: 3px;
  font-weight: bold;
  
  &:hover{
    background-color: #fff;
  }
}

.btn--transition{
  -webkit-transition: -webkit-transform .2s; 
  -webkit-transition: all 200ms ease-in-out;
  transition: all 200ms ease-in-out;
}

.main-nav{
  list-style: none;
  padding: 0;
  margin: 0;
  text-align: center;
  
  li{
    margin: 0 0 30px 0;
    
    a{
      font-size: 60px;
      color: #000;
      font-weight: bold;
      line-height: 80px;
      
      &:hover, &:focus{
        border-bottom: 7px solid #000;
      }
    }
  }
}

/*
 * Full menu
 * ----------
 * Styles in this section are very
 * important and you have to implement
 * them if you want for your
 * navigation to work properly.
 *
 */

.full-menu{
  visibility: hidden;
  display: table;
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  opacity: 0;
  background-color: rgba(256, 256, 256, 0.92);
  -webkit-transform: scale(0.85);
  -ms-transform: scale(0.85);
  transform: scale(0.85);
  .full-menu--transition;
}

.full-menu--open{
  visibility: visible;
  opacity: 1;
  -webkit-transform: scale(1);
  -ms-transform: scale(1);
  transform: scale(1);
}

.full-menu--transition{
  -webkit-transition: all 200ms ease-in-out;
  transition: all 200ms ease-in-out;
}

.full-menu--middle{
  display: table-cell;
  vertical-align: middle;
}

.menu-toggle{
  border: 0;
  color: #fff;
  background-color: transparent;
  
  &:before{
    content: '\f0c9';
    font-family: 'FontAwesome';
    margin: 0 20px 0 0;
  }
}

.menu-toggle--close{
  position: absolute;
  top: 30px;
  right: 30px;
  
  &:before{
    content: '\f00d';
    color: #000;
    font-size: 40px;
    margin: 0;
  }
}
              
            
!

JS

              
                /*
 * Icon
 * --------
 * This code toggle classes for
 * our navigation.
 *
 */

$('.menu-toggle').on('click', function(){
  $('.full-menu').toggleClass('full-menu--open');
})
              
            
!
999px

Console